#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>

int main()
{
    printf("testexec ... begin!\n");
    pid_t id = fork();
    if(id == 0)
    {
        //putenv("HHHH=111111111111111111");
        // 我的父进程本身就有一批环境变量！！！, 从bash来
        //char *const argv[] = 
        //{
        //    (char*)"mypragma",
        //    (char*)"-a",
        //    (char*)"-b",

        //    NULL
        //};
        ////char *const envp[] =
        //{
        //    (char*)"HAHA=111111",
        //    (char*)"HEHE=222222",
        //    NULL
        //};
        //extern char**environ;
        printf("child pid: %d\n", getpid());
        //sleep(2);
        //execvpe("./mypragma", argv, environ);
        ////execvpe("./mypragma", argv, envp);
        //execl("/usr/bin/python3", "python3", "test.py", NULL);
       // execl("/usr/bin/bash", "bash", "test.sh", NULL);
//execl("./mypragma", "mypragma", NULL);
        sleep(2);
        execvpe("./mypragma");
        char *const argv[] = 
        {
            (char*)"ls",
            (char*)"-l",
            (char*)"-a",
            (char*)"--color",
            NULL
        };
        ////child
        //execl("/usr/bin/top", "top", NULL);
        execlp("top", "top", NULL);
        //execv("/usr/bin/ls", argv);
        execvp("ls", argv);
        exit(1);
    }

    // fahter
    int status = 0;
    pid_t rid = waitpid(id, &status, 0);
    if(rid > 0)
    {
        printf("father wait success, child exit code: %d\n", WEXITSTATUS(status));
    }
    printf("testexec ... end!\n");
    return 0;
}

